package demo3;
import java.util.*;
public class Test {



    // 注意类名必须为 Main, 不要有任何 package xxx 信息
    public class Main {
        public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
            // 注意 hasNext 和 hasNextLine 的区别
            while(in.hasNextLine()){
                String str1 = in.nextLine();
                String str2 = in.nextLine();
                func(str1,str2);
            }

        }
        public static void func(String str1,String str2){
            HashSet<Character> set1 =new HashSet<>();
            HashSet<Character> setBroken =new HashSet<>();

            for(char ch:str2.toUpperCase().toCharArray()){
                set1.add(ch);

            }
            for(char ch : str1.toUpperCase().toCharArray()){
                if(!set1.contains((ch)) && !setBroken.contains(ch)){
                    System.out.print(ch);
                    setBroken.add(ch);
                }
            }

        }
    }
}
